Improvement in saw-mill dogs



and driven, by means of a lever,

D D D work in them.

UNITED s'rA'rns PATENT OFFICE ALBERT CUN NINGHAM, OF MILWAUKEE, WISGONSIN, ASSIGNOR TO JOHN M.

' STOWELL, OF SAME PLACE IMPROVEMENT IN SAW-MILL DOGS.

Specification forming part of Letters Patcnt No. 192.817, dated July 10, 1877 application filed March 31, 1877.

To all whom it may concrn:

Be it known that I, ALBERT CUNNINGHAM, of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvementsin SawMill Dogs; and I do hereby declare that the following is a full, clear, and exact description thei-cof, which Will enableothers skilled in the artto which it pertains to make and use the same, reference being had to the accompanying drawing, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to that class of sawmill dogs wherein curved hooked teeth are pivoted to the standard of asaw-mill carriage into the log, thereby securely fastening it to the carriage, and is. an improvement upon the patent granted to me April 11, 1876, No. 175,85 5.

Figure l is a side viewof my improved dog. Fig. 2 is a front view of the same.

Similar letters in both denote corresponding parts.

A is the bed-plate of the dog, which I usually construct of cast-steel or malleable iron. It may be either a separate piece attached to the standard, or it may be so constructed as to form the standard itself, as may be preferred. To it are pivoted curved hooks or dogs D D D, which may be of any desired form, but I prefer to construct them with double teeth, in the manner and of 'the form shown in the drawing. f f f denote the pivots. C is astrong plate of wrought-iron or other suitable material, on the inner side of which are the projecting lugs t' i, which project into and slide freely in the diagonal recesses or slots a a. Dogs D D D are between plate G and bed-plate A. To the plateC, near its front edge. the upwardly-projectiug teeth c 0 c are firmly attached in the position shown in the drawing. Through the plate G are cut the eccentric-shaped slots d d d, and pins e e e securely fastened in the rear end of the dogs Slots d d d are of upward moton through link h to plate C. As

G moves upward it is guided forward also, and takes the direction of the diagonal slots a a. This "projects the teeth c c c upward and outward, and into the log from beneath. At the same time motion is communicated to dogs D D D through the curvedslots'd dd and pins ee e moving their points outward and dlownward with a constantly-increasing force and dilninishing rate of motion, so as to clutch the log firmly. Any suitable device may be employed for fastening it in this position. The dogs D D D are made with the tooth last thrown forward farther from the pivot f, and hence fitted to reach forward farther and gripe the log, pro- Vided the inner-tooth does not do so.

It is designed to place an outside protectingplate over all the parts, a portion of which appears at B and at the top. This is merely to protect the parts from dust and interference by outside objects.

What I claim as new, and desire to secure by Letters Patent, is

The combinat-ion of the standard A, having the slots a a, with the plate C provided with the teeth a c,eccentric slots d d, and lugs ?I i, the dogs D D having pivots f f, the link h, and lever E, all constructed and oper- `ating as shown and described, and for the purpose specified.

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses.

` ALBERT GUNNINGHAM'.

Witnesses:

E. H. BOTTUM, C. M. BOTTUM. 

